Friction brake



J. 5. THOMPSON FRICTION BRAKE Fi led Sept. 24, 1926.

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" s; monson, or m YORK, N.

; a 1,696,821 PATENT oFFIcE.

Y.,- ASSIGNOB TO 'AMERICAN BRAKE MA- oonroaa'rroa'r, or NEW YORK, 11. Y., A coarona'rxon or mew YORK.

rnIc'rIon mun.

Application filed September 24, 1926. Serial No. 187,425.

This invention relates to shoes for friction brakes; and more particularly to that type of-shoe'which Comprises a composition body mountedzon a metal back. N

The ob 'ect of the invention is to provide an eflicients oe for a friction brake and having its body secured. to the metal back in a novel manner which will endure throughout the life of the shoe-in service.

Another object of the invention is to provi'de novel means for securing the body to. the :back of the shoe which will maintain the sha of the body and prevent undesired 'wea nesses from developing in the body in the manufacture .Shoe. I

' And a further object of the invention is to embed the body in a back having the form of a shell and to revent the body from buckling or springing away from contact with the back of the shell y body to the shell in an efficient manner and thereby maintain the body in a desired S120 and actual service 'of the and shape with a uniform wearing surface.

And a still further object'of'theinvention is to provide special means for securing the bod to the back at or about the middle of the s e and which means will not project beyond the general shoe.

In the accompanying drawings I have illustrated the'invention in aselected embodiment plane of the back of the which I have found satisfactory in practical use and referring thereto Fig. 1 is a side elevation of the shoe partly broken away and in section;

Fig. 2 is a back plan few of the shoe; vFig. 3 is an endview and Fig. 4 is a transverse sectional-view on the line 4-4 of Fig. 1. Y

The body 5 of the shoe is made of a suitable composition which will provide friction sufiicient for thein'tended pur se andwhich is wear and heat resistant. do not claim the composition inthis application because this invention is not restricted to the use of a particular-com sition but is capable of use with a body ormed of any composition suitable for the intended purpose. Therefore I donot restrict myself in this applicatlon to the use of any particular composition so long as it is capable of producing satisfactory results. v

The shoe is concavo convex in form and it is provided with a metal back which is made securing the fast to the concave back of the body. I have found'it convenient and satisfactorv to make are located in the side edges of'the shell where the flange 8 joins the back 9, the perforations being partly in the flange and partly-in the back. Other perforations 10 are provided in anysuitable size, number and'arrangement in the back of the shell. In the commercial embodiment of this invention I liave found it convenient to provide two rows of these per-. forations 10, as shown in Fig. 2. A panel'll centrally disposed between the sides of the shell and extending lengthwise thereof is offset to form on the back 'of the shell a shallow ,channel, and this channeled portion of the back of the shell is provided witha plurality .of perforations 12 to receivethe bod material. That portion of the backof t c shell having the perforations 12 is channeled so. that the composition body material may project'through theperforations 12 and spread out in the form of a. button .13 around the edges of the perforations to anchor the body to the shell firml and securely,- without projecting beyond t e general plane of the back of the shell.

It has been discovered that in the manu-' facture of com osition friction shoes there is a tendency at tlmes for the back to bul e for-- wardlyso that the convex wearing fhce of the body will be curved or bulged transversely or longitudinally or both. This does "not appear in all shoes and it is generally not to an objectionable degree in those shoes in which it ap ears but itiis desirable, of course, to pro uce a standard shoe at all times and I have found that this can be tween the body and the shell through the middle of the shoe. It will be understood that the body composition embeds itself in assured by providing an efficient anchor be-' l materially, if at all, to the cost of manufacture and it prevents the central portion of the shoe from bulging or bridging on the back, and it insures permanency; interlocking engagement between the y and the back throughout the process of manufacture and actual service-of. the shoe.

Provision may be made for fastening the shoe to a su port and for this purpose sections 14 of t e ends of the shell may be cut and turned down inwardly upon the back of the shell'to provide a double thickness of metal at the bottom of recesses 15 formed in the ends ofthe body.

I have found it convenient and desirable to provide a metal back in the form of a shell but this may not be-necessary in all embodi ments of the invention and since it is not essential I do not restrict the invention thereto butmay make the back in the form of a plate without sides or ends in any form that may be found satisfactory; and I also reserve the right to make any other changes that may be found desirable within the scope of the following claims;

I claim: 7

1. Afriction brake shoe comprismg a composition body and a metal back thereon, said back havi a channel-formed therein and provided with perforations, parts of the body extending through said perforations and into said channel to anchor the body to the back. v

2. A friction brake shoe comprising a composition body and a metal back thereon, said back having a channel formed therein and provided with spaced perforations, parts of the-body extending through said perforations and spread out on the back around the edges of the perforations to anchor the body to the back. r.

a 3. A friction brake shoecomprising a composition body and a metal back'thereon, said ack havi a lon' "tudinal channel formed therein an 'provi ed with spaced perform tions, parts of the body extending through said perforations to anchor the to the depressed part being provided with perforahaving a depression therein and said tions,. parts of the body extending through said perforations and forming button'svwithin the depression to anchor the body to'the back.

ack being bent on substantially parallel lines extending longitudinally of t 1e back to forman inwardl said channel portlon of the back being per;

.forated to receive portions of the composition.

7. A friction brake shoe comprising a composition body and a metal back thereon, saidback being bent on substantially parallel lines extending longitudinzilg of the back to form an inwardly depres channel, and said channel portion of the back being perforated to receive portions of the composition,

said portions being spread,to overlap the edges of the perforations and forming butchannel.

tons within the JAMES S. THOMPSON.

6. A friction brake shoe comprising acomosition body and a metal back thereon, said depressed channel, and 

